*{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
    list-style: none;
}
img{
    display: block;
    width: 600px;
    height: 400px;
}
.banner{
    width: 600px;
    height: 400px;
    margin: 10px auto;
    position: relative;
}
.pics{
    position: relative;
}
.pic{
    position: absolute;
    left: 0;
    top: 0;
    opacity: 0;
}
.page{
    position: absolute;
    width: 100%;
    height: 20px;
    bottom: 20px;
    left: 0;
    display: flex;
    justify-content: center;
    span{
        width: 15px;
        height: 15px;
        border-radius: 50%;
        background-color: white;
        margin-right: 10px;
    }
}
.pver,.next{
    width: 30px;
    height: 80px;
    font-size: 30px;
    text-align: center;
    line-height: 80px;
    position: absolute;
    top: 160px;
    color: white;
    background-color: rgba(0,0,0,.5);
}
.pver{
    left: 0;
}
.next{
    right: 0;
}
.active{
    background-color: red!important;
}
.opacity{
    opacity: 1!important;
}